Properties of the Number 20950

Twenty Thousand Nine Hundred Fifty

Basics

Value: 20949 → 20950 → 20951

Parity: even

Prime: No

Previous Prime: 20947

Next Prime: 20959

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 ² × 419

Divisors: 1, 2, 5, 10, 25, 50, 419, 838, 2095, 4190

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000111010110

Octal: 50726

Duodecimal: 1015A

Hexadecimal: 51d6

Square: 438902500

Square Root: 144.74114826130128

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7. A252157

Number of integer partitions of n that contain at least one even part and whose halved even parts are relatively prime. A366845

Number of ways to write n as the root-mean-square (RMS) of a set of distinct odd integers. A211868

Approximation of the 3-adic integer exp(-3) up to 3ⁿ. A309901

Numbers k such that k and k+1 are both divisible by the total binary weight of their divisors (A093653). A338514

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) + 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4. A294415

E.g.f. satisfies A(x) = 1/(1 + log(1 - x·A(x)²))². A377427

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7. A252150

Expansion of (f(-x)³ / f(-x²))⁶ - 64·x * (f(-x²)³ / f(-x))⁶ in powers of·where f() is a Ramanujan θ function. A258739

Number of n X 1 0..3 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order. A268419